Snopiński Przemysław, Hilšer Ondřej
Department of Engineering Materials and Biomaterials, Silesian University of Technology, 18A Konarskiego Street, 44-100 Gliwice, Poland.
Faculty of Mechanical Engineering, VSB-TU Ostrava, 17. Listopadu 2172/15, 708 00 Ostrava, Czech Republic.
Materials (Basel). 2024 Aug 19;17(16):4098. doi: 10.3390/ma17164098.
In this article, the evolution of microstructural characteristics of selectively laser-melted AlSi10Mg alloy subjected to equal channel angular pressing (ECAP) is investigated. The microstructures were analyzed in detail using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission Kikuchi diffraction (TKD), and transmission electron microscopy (TEM). A heterogeneous ultrafine-grained microstructure was produced after one ECAP pass at 100 °C. This microstructure was composed of Al/Si cells and sub-micrometer grains. The grains were refined by conventional dislocation processes; however, evidence of dynamic recrystallization was also documented. Furthermore, it was revealed that the Al/Si cells contribute significantly to grain refinement. EBSD/TKD investigations showed that cell misorientation increased after ECAP processing, resulting in an increased fraction of grains with very low misorientation angles.
本文研究了经等通道转角挤压（ECAP）的选择性激光熔化AlSi10Mg合金微观结构特征的演变。使用扫描电子显微镜（SEM）、电子背散射衍射（EBSD）、透射菊池衍射（TKD）和透射电子显微镜（TEM）对微观结构进行了详细分析。在100°C下进行一次ECAP道次后，产生了异质超细晶粒微观结构。这种微观结构由Al/Si胞和亚微米晶粒组成。晶粒通过传统的位错过程细化；然而，也记录了动态再结晶的证据。此外，研究表明Al/Si胞对晶粒细化有显著贡献。EBSD/TKD研究表明，ECAP加工后胞的取向差增加，导致取向差非常小的晶粒比例增加。
